摘要:
The application discloses methods for recycling polymeric materials, particularly cured rubber e.g. derived from tyres and the like. The polymer material is reduced to particulate form, and subjected to a surface activation treatment, preferably a cold gas plasma treatment. The resulting particles show excellent properties when blended with matrix or binder materials which are then cured or set to form new articles. In particular, the activated surfaces make intimate bonding contact with the surrounding matrix or binder, so that large proportions of particulate material can be recycled into new products which exhibit good performance, e.g. elastomeric performance.
摘要:
The application describes methods and apparatus for recovering materials from waste carpet and of the like products. The carpet material is initially shredded into coarse pieces. These are optionally dried and then subjected to cooling to embrittle at least one components, such as a polymer backing material, while leaving other component e.g. tuff fibres, flexible. In the cooled condition, the pieces are subjected to mechanical action such as hammering or rolling to break up the embrittled material, and these fragments are separated from the other material and recovered. Preferably a drying stage is applied after the mechanical fragmentation, before separation. The procedure may be repeated, optionally with different temperatures to selectively embrittle and fragment different components and facilitate their separation.
摘要:
The application discloses a variety of ways of making composites, particularly mats, in which a fabric layer and an uncured rubber layer are superimposed in a mould having opposed plates, and subjected to heat and pressure between the plates to cure the rubber and join it to the fabric. Methods and means are disclosed for protecting the fabric against the effects of moulding heat and also for keeping fabric pieces in position.Other methods disclosed relate to providing three-dimensional configuration on the fabric-covered surface. Characteristic moulding apparatus and characteristic composite products are aspects of the disclosure.
摘要:
The application discloses coherent, processable rubber compositions containing cured rubber particles, especially recycled crumb rubber, dispersed in a curable base rubber. A processable composition, particularly one which can be roll-processed into a self-sustaining web is achieved by including in the curable rubber a low-viscosity curable rubber component such as a liquid rubber. This component wets the crumb rubber enabling it to disperse fully during mixing and connect intimately into the structure upon curing. This technique enables larger quantities and/or smaller particle sizes of the crumb rubber to be successfully incorporated while maintaining processability. Inert fillers can be used or omitted, reducing density. The novel rubber compounds are particularly suitable for making into layer products such as mats and flooring materials. Desirably these are laminated with fabric such as tufted textiles. This can be done in a compression moulding process.
摘要:
The application discloses a variety of ways of making composites, particularly mats, in which a fabric layer and an uncured rubber layer are superimposed in a mould having opposed plates, and subjected to heat and pressure between the plates to cure the rubber and join it to the fabric. Methods and means are disclosed for protecting the fabric against the effects of moulding heat and also for keeping fabric pieces in position.Other methods disclosed relate to providing three-dimensional configuration on the fabric-covered surface. Characteristic moulding apparatus and characteristic composite products are aspects of the disclosure.